Motor attachment for sewing machines



Nov. 8, 1927.

B. GROSSBARD MOTOR ATTACHMENT FOR SEWING MACHINES Filed Dec. 11, 192e /aaw/oo A TTORNE Y Patented Nov. 8,1927.

AU'mfreu STATES PATENT o-Frica.

MOTOR' ATTACHMENT ron sEWrNG MACHINES.

Application med December 11,'1926. seria; No; 154,i21.

. This invention relates. to motoii` attach-.- ments for sewing machines, and has for its principal object to provide a clutch mechaz nism of Inovel construction, readily applied 6 to the drive shaft of a motor and the operating wheel of a sewing machine.

Another object of this invention is topro 4vide a motor .attachment for sewing machines, having therein -a novel double grip- 10 pin clutch mechanismadapted to. satisfactor' y control the speed at which the sewing machine is to operate. i Another object of the present invention isto provide a novel clutch mechanism adapt- '15 ed for use in connection-with a. sewing machine and a motor, wherebyA the sewing machine may be conveniently thrown into and out of o eration and may be satisfactorily a regulate as to speed. A further object of the resent 4`invention is to `provide a novel c utch mechanism adapte lor use with a motor and va power driven machine whereby the machine may be operated by the motor at various speeds. A further object of the present invention is to provide a novel "clutch mechanism adapted for use with a motor anda power driven machine whereby the 'machine may l be made to operate at various speeds by the motor or. the'motor may be permitted to op-v erate, independently of the machine.l

Other objects 1more or less apparent willbe disclosed and'described in the following specification and shown in the accompany- 35. in drawing, -in which:

ig. 1 is a bottom plan view-of an attachment .for sewing 'machines embodying myl invention;

- Fi 2 is a slde viewof the same showing- 40 the c utch member-1n cross sectlon and 1na disengaged position; and

' Fi 3 1s an enlarged sectional' view of' clutc member Ashowing the same in an enegaedposition,

l eferring to the drawings,- the numeral 1 designates a motor of' the usual type and construction having -a shaft 2. =Detachably securedtotheshaft 2 by a set screw 3 is a wheel4. Fitting around -the wheel 4 is a iy whee1'5," having 'a shaft 6'integra11y-attached thereto which is rotatably located iny side a bearing 7. The bearing-7 is held in lace on a'. base 8 by asupport'9 which fits vinside aprojection 1001i the base ,i.the said -outside part of thelpad 15 1 movement of any l. ing' 7.

support being held in place and 'adjusted by boltscrew 11. y Located between the wheel 4 and the inside surface 'of the flywheel' 5 is a circular" `str'ucted from leather or other suitable material, havin its inside circumferentialpart 16 positione lential partof the circular disc 13 and the inner surface 'of the said fly wheel. The

projects outbetween the outer circumferwardly beyond the circular disc 13v and is t adapted to contact with the inside surface of wheel A4. When the screw 14' is screwed into the fly wheel 5` the circular disc,becomes slightly' cone shaped owing to. the fact that its outsidecircumferential edge is not permitted to be moved inwardly with its central part because of the location between it and the fly wheel ofthe inside circumferential 'part 16 of the circular disc 15.A The outer circumferential ledge ofthe circular pad 15 is also caused to project oiitwardly `toward -the wheel 4 when the screw 14 is -screwed into the fly. wheely 5, and it is this part of the said pad that firstly contacts with thev said wheel' 4 when the clutchmember is moved toward the same, as will be explained herein. The contact l`.between the fly wheel 5, the circular gripping pad 15 and the circular disc 13 is loose enough to permit the o one of these partsindependentl ofthe other, thereby affording a means. or transferring motion from the wheel 4 tothe fly wheel 5 in a gradual manner.

The. motor 1 is` attached to the base 8 by screws 17 and the base is's'uitably attached by bolts or other means to asewi`n machine or other mechanism -to be operateA V Y Located around the shaft 6' between the beari-n 7 -and the' ily wheel -5'is a-s1eeve18 which'ls adapted to maintain the iiy wheel 1n its proper position in reference to the bear- Located at the* end of the lshaft 6 within an identation' therein, is a steel ball 19, the same being movably held on the end of the said 4 shaft by vend of the said shaft and is suitably secured o come into contact with the same.

thereto by a screw or other means.

VThe base 8 is provided with a projection 21, having therein a: suitable recess for the insertion of a bar 22,`A` the samebeing adjustably held within the projection by a set screw 23.

Pivoted on the bar '22 by means of a pin 24 is a lever 25 which has an extension 26. thereon, the said extension rojecting slightly beyond the ball 19 and eiiig adapted to Forming a -part of the bar 22 is an'extension'member 27, to the end of which is at- A tached one end of a spi-ral wire spring 28.

' the shaft 6,`the ily wheel 5, the circular .The other endy of the s ring rests against the lever 25 and tends to lieep the extension 26 from pressing against the' ball .19.

Attached by 'a screw 29 to the upper part of the lever 25, just below the ily wheel 5 is a leather piece 3() which serves to prevent the revolvin of the y wheel when the device is not to operated.

An extension rod 31 connects the lever 25 and a foot edal or other device for `throwing the machine to be operated through belt 32 into or out of operation.

When the attachment is out of operation the s ring 28 forces the lever 25 upwardly, there y causing the extension 26 to be released from contact, with the ball 19, and the Aleather piece 30 to press against the y wheel 5, thereb preventing the said fly wheel from revo ving.

yTo. cause the sewing machine or other mechanism to operate, the rod 31 is pulled in a downward direction, thereby carrying with it lever 25, which causes the extension 26 to move inwardly and be forced against the ball 19. The wheel 4 whi h is secured to the shaft 2 revolves with the said shaft upon the movement ofthe motor. As the balld19,

isc 13 and the gripping pad 15 are forced inwardl by the extension 26, the outer circumferential edge of the gripping pad 15 firstly Apad`15 is comes into contact with the wheel 4, thereby causing the ily wheel to revolve with comparatively slow speed. As the pad 15 is forced inwardly still further, a greater part of its surface is caused tocontact with/the wheel 4, and the ily wheel is thereby made to move faster. y When the clutch mechanism is in the positionshown in Fig: 3 the gripping in firm contact vwith the wheel 4, and the maximum amount of motion is being transferred tothe :dy wheel.

lThe construction of the clutch mechanism with the gripping pad 15 located around thecircular disc '18 in the manner described, en

, ables the operation of the sewing machine Vor y other mechanismat any desired'speed, de-

pendent solelyuponA the downward force applied to the rod 31.

includedwithin the spirit of the appended claims.

Having described my invention, what I aim is:`

1.. A motorattachment of the class described com rising, in-combination with a motor, a w eel secured to the shaft of a motor, a fly wheel having a shaft thereon,

a disc attached to the fly wheel, a, gripping pad located in the iiy wheel with a part thereof `extending between the disc and the ily wheel and another part thereof project ing beyond the disc, and means for moving the ily wheel whereby the gripping pad may be brougnt into contact with the iirst mentioned wheel. i

2.. A motor attachment of the class described comprising, in combination with a motor, a wheel secured to the shaft of the motor, ally wheel located adjacent the mentioned wheel, a disc movably attached to the fly wheel-having a gripping `pad movably located around its outer edge and between it and the ily wheel, and means for moving the `l pad may be rst mentioned wheel..

3.. A motor attachment of the class describedcomprising, in combination with a motor, a wheel secured to the shaft of the wheel whereby the gripping i rought into contact with the motor, a fly wheel located adjacent the said i wheel, a cone shaped disc movably attached to the fly wheel, a gripping pad movably located inside the ily wheel with a part thereof extending between the disc and the y wheel and anotherpart projecting beyond the said disc, and means for moving the ily wheel whereby the gripping pad may be brought into contact with the first inen-` tioned wheel.

4. A motor attachment of the classl described comprising in combination with a motor, a wheel secured tothe shaft of the motor, v wheel, a cone shaped disc movably attached to the fly wheel having a gripping pad movably located around its outer edge and'be-4 l tween it and the ily wheel-,and means for moving the fly4 wheelwhereby the gripping pad may be made to contact with the first mentioned wheel.

5. A motor attachment of the Tclass dey` scribed comprising, in combination with a a fly wheel located adjacent the said motor having a shaft, a wheelsecured to thev motor shaft, a fly wheel located adjacent the said wheel and a flexible cone shaped disc movably attached to the fly wheel having a gripping pad movably located around its outside edge with a part thereof located between the disc and the fiy wheel, and means for moving the iiy wheel whereb the gripping pad may contact with the st named wheel.

6. A motor attachmentbf the class ldescribed comprising, in combination with a. motor having a sha-ft, a wheel secured to the shaft a iy wheel. located adjacent the said whee having a member movably attached to `the y wheel having a` gripping pad movably attached flexible cone shaped clutch thereto, and means for moving the fly wheel whereby the gripping pad'may be `made to contact with the first mentioned wheel.

7. A' motor attachment of the class described comprising, in combination with a ,motor having a shaft, a Wheel secured to the shaft, a iiy wheel located adjacent the wheel,

ailexible cone shaped clutch member mov.-v

'ably attached to the y wheel having a gr1pping pad attached thereto and located bev tween the fly wheel and the first Amentioned wheel, and means for "movin whereby the iy wheel and, wheel may be -made to contact with the gripping pad.

BARNET .GRossBAimA` the iyfyvheel. st mentioned 

